Thread clipper for bag machines



M. R. KENDALL THREAD CLIPPER FOR BAG MACHINES Filed Sept. 14 1920Patented Uct. 14, 1224..

ivianvm a. KENDALL, on nu'rcnrnson, KANSAS.

THREAD CLIPPER FOR BAG- MAGHINESL Application filed September 14, 1920.Serial No. 410,296.

To all whom it may concern:

Be it known that I, MARVIN R. KENDALL, a citizen of the United States,residing at Hutchinson, in the county of Reno and State of Kansas, haveinvented new and useful Improvements in Thread Clippers for BagMachines, of which the following is a specification.

The object of the invention is to provide readily attachable means foruse in connection with bag sewing machines, such as are used in bag andsack factories, for severing the thread or twine employed for sewing orstitching these receptacles without requiring special effort,manipulation, or movement on the part of the operator and thereforewithout interrupting the work, and consequently under such conditions asto avoid loss of time; and more particularly to provide means for thepurpose indicated which may be actuated, or set and released, andcontrolled, for example, by the treadle which serves to start and stopthe sewing or stitching machine, either through a switch, if electricmotive power is used, or though any equivalent means approved in theart, to the end that when a seam or run of stitching has been completedthe movement of the treadle to stop the needle will cause the severanceof the thread, so that the material may be adjusted at once for thesucceeding seam or line of stitching.

With this object in view the invention resides in an organization ofelements of which a preferred embodiment is illustrated in theaccompanying drawing, wherein Figure 1 shows aside view of the apparatusapplied in the operative position to a bag stitching machine, theclipper being shown in full lines in the closed or cutting position andin dotted lines in the open or set position.

Fig. 2 is a plan view of the same.

Fig. 3 is a detail section on the line 33 of Fig. 2.

Fig. i is a detail of one end of the yoke.

Fig. 5 is a section on line 5-5 of Fig. 2.

Essentially the device consists of a reciprocable yoke 10, actuated andyieldingly i1npelled in one direction by a spring 11, a cutter 12 ofwhich. one of the complemental blades is connected with the yoke, formove ment thereby, and a latch or lock 13 for re taining the yoke andcutter in a set position in opposition to the cutter-actuating tendencyof said spring and adapted to be tripped by the treadle 1 1 of thesewing machine when the latter is moved to check or interrupt theoperation of the machine;

The cutter, as shown, is in the form of shears having blades 15 and 16pivotally connected at 17 and extended to form arms 15 and 16 of whichthe former is pivoted to a clip 18 secured to thebed-plate 19 orequivalent convenient part of the sewing machine and the latterispivoted to the end of the yoke 10. The yoke consists of a'rod plane atthe rear side of and close to the machine arm while the stem or uprightof the yoke is arranged to the right hand of the standard of the arm,the usual space 00- cupied by the work is left unobstructed so that nochange in the customary handling of the goods or material or of thesacks is made necessary by the presence of the clipping device.

It will be seen also that the connection of the blades of the cutter bywhat may be termed a floating pivot, movable in a path concentric withthe pivot 18 of the arm 15 on the clip 18, serves in the operation ofthe cutter to cause a swinging movement or alternate advance andretraction of i the blades,the retraction occurring as the cutter isopened to the set position shown in dotted lines in Figure 1, and theadvance movement occurring as the cutter closes under the action of thespring to clip the thread, so that the ends of the blades do not projectobjectionably beyond the needle 26 and interfere with the view of theoperator or the guidance of the work during the stitching operation ofthe machine.

' Beneath the machine table the yoke stem is connected by a swivel joint27 with a rocking lever 28, fulcrumed upon a pendent bracket 29 attachedto the table, and from the rocking lever extends a connecting rod 30 toan operating lever 31 fulcrumed upon a bracket 32 secured to the flooradjacent to the machine treadle 14, and' movable ina vertical ,pIaneparallel therewith.- Tweeterating lever is disposed in the path of ,an

arm 33 carried by the treadle to the end that when the latter is movedthe 'directioii of the arrow in Fig. l to start the machine the rockinglever is tilted to open or set the cutter and place the spring 11 undertension,-in which positions the parts are maintained, by the latch 13whiclri'engagesgthe operating leveryas shown in Fig.3; The

' latch :has a shoulder 34; for this purpose, and

maybe yield-ingly held 'in position to engage the lever as" by?a'spring35,; or its equivalent. In the ipathof movement in the opposite di- Inadopting theapparatus to various types :sizes. of machines inconnect-ion with whichra t'hread clipper may be employed it "desirablevto provide for certain adjustinents, relatively, "ofjt'he elementsthereolf, andtherefbre-the'pin 24: at the terminal of the yokeisthreaded for a stop nut 25 in ac'ldition to the holding nut 21), and thestem of the yoke is threaded to receive a nut 27 for engagement with theeye of the swivel 27. Also, the connecting rod 30 is made of extensibleform with. its sections 3O 3O overlapped and secured by the collars 30having setscrevvs 30?, or equivalent means.

What I claim is:

In combination with a controlling treadle for stitching machines,movable in opposite directions, a thread clipper including fulcru-niedshear blades one of which is mounted on a fixed pivot thereby to permitthe fillcrumed blades to swing in an arc, an arm connectedwith the otherof said blades, a compressible spring connected with said arm, a leverconnected with said arm and pivoted to the machine, anotherleverpivotally supported adjacent the treadle and operatively connectedwith said first men tioned lever, meanscarried by the treadle forengaging with the last mentioned lever at one side ofits pivot,- and alatch device controlled by. the treadle and also adapted to engage withthe said-last mentionedlever.

MARVIN R. KENDALL.

